Attributes / relations provided by
♦ ¹Changes in the diet of Great Black-backed Gulls Larus marinus on Skomer Island 1958- 1992, Jim Poole, SEABIRD 17; 50-55
♦ ²Correlates between morphology, diet and foraging mode in the Ladder Snake Rhinechis scalaris (Schinz, 1822), Juan M. Pleguezuelos , Juan R. Fernández-Cardenete , Santiago Honrubia , Mónica Feriche , Carmen Villafranca, Contributions to Zoology, 76 (3) – 2007